RTR (Ready To Run) means that you get the complete playable model which includes everything including electronic parts—equipped model itself and RC transceiver, battery and so on, by which you can play after you slightly assemble it .

Specification 

Name: Atomic (792-4)

Material: ABS Hull

Package includes: 

The boat model

Servos: 40g waterproof

Motor: Brushless 1800KV Water cooled

ESC: Brushless water-cooled ESC 40A

Tx: 2.4G 2-CH Surface Radio

Rx: 2.4G 2-CH Surface Rx

Battery: 3S  11.1V 2600mAh Lipo

Charger